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import { SET_MAP_DIMENSIONS, setMapPosition, setMapScale } from '../../actions/map'
import { SET_CURRENT_TOPOLOGY } from '../../actions/topology/building'
import {
MAP_MAX_SCALE,
MAP_MIN_SCALE,
SIDEBAR_WIDTH,
TILE_SIZE_IN_PIXELS,
VIEWPORT_PADDING,
} from '../../components/app/map/MapConstants'
import { calculateRoomListBounds } from '../../util/tile-calculations'
export const viewportAdjustmentMiddleware = store => next => action => {
const state = store.getState()
let topologyId = '-1'
let mapDimensions = {}
if (action.type === SET_CURRENT_TOPOLOGY && action.topologyId !== '-1') {
topologyId = action.topologyId
mapDimensions = state.map.dimensions
} else if (
action.type === SET_MAP_DIMENSIONS &&
state.currentTopologyId !== '-1'
) {
topologyId = state.currentTopologyId
mapDimensions = { width: action.width, height: action.height }
}
if (topologyId !== '-1') {
const roomIds = state.objects.topology[topologyId].roomIds
const rooms = roomIds.map(id => Object.assign({}, state.objects.room[id]))
rooms.forEach(
room =>
(room.tiles = room.tileIds.map(tileId => state.objects.tile[tileId])),
)
let hasNoTiles = true
for (let i in rooms) {
if (rooms[i].tiles.length > 0) {
hasNoTiles = false
break
}
}
if (!hasNoTiles) {
const viewportParams = calculateParametersToZoomInOnRooms(
rooms,
mapDimensions.width,
mapDimensions.height,
)
store.dispatch(setMapPosition(viewportParams.newX, viewportParams.newY))
store.dispatch(setMapScale(viewportParams.newScale))
}
}
next(action)
}
function calculateParametersToZoomInOnRooms(rooms, mapWidth, mapHeight) {
const bounds = calculateRoomListBounds(rooms)
const newScale = calculateNewScale(bounds, mapWidth, mapHeight)
// Coordinates of the center of the room, relative to the global origin of the map
const roomCenterCoordinates = {
x: bounds.center.x * TILE_SIZE_IN_PIXELS * newScale,
y: bounds.center.y * TILE_SIZE_IN_PIXELS * newScale,
}
const newX = -roomCenterCoordinates.x + mapWidth / 2
const newY = -roomCenterCoordinates.y + mapHeight / 2
return { newScale, newX, newY }
}
function calculateNewScale(bounds, mapWidth, mapHeight) {
const width = bounds.max.x - bounds.min.x
const height = bounds.max.y - bounds.min.y
const scaleX =
(mapWidth - 2 * SIDEBAR_WIDTH) /
(width * TILE_SIZE_IN_PIXELS + 2 * VIEWPORT_PADDING)
const scaleY =
mapHeight / (height * TILE_SIZE_IN_PIXELS + 2 * VIEWPORT_PADDING)
const newScale = Math.min(scaleX, scaleY)
return Math.min(Math.max(MAP_MIN_SCALE, newScale), MAP_MAX_SCALE)
}
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